libc/eglibc: backport OpenEmbedded patches for eglibc 2.16

With this 3 patches, I was able to build and run an eglibc-based system
on MIPS(el) and ARM targets.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

reporter_name="Thomas Petazzoni"

reporter_url="http://www.free-electrons.com/"

reporter_comment="Very basic testing only"